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Commitments and Contingencies - Additional Information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended 48 Months Ended
Jul. 15, 2010
Plaintiff
Jun. 30, 2017
USD ($)
lease
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
loan
lease
certificate
repurchase_request
Jun. 30, 2016
USD ($)
Dec. 31, 2007
certificate
Dec. 31, 2004
certificate
Dec. 31, 2007
certificate
Dec. 31, 2016
USD ($)
Loss Contingencies [Line Items]                  
Number of noncancelable leases (in leases) | lease   4   4          
Operating lease expiration dates       2028          
Future lease commitments with expiration date   $ 18,167   $ 18,167          
Operating lease expense       1,000 $ 1,000        
Guarantee obligations   20,692   20,692         $ 21,668
Guarantee obligations, credit reserve   10,000   10,000          
Special Purpose Entities (SPEs) assets   48,000   48,000         49,000
Special Purpose Entities (SPEs) liabilities   21,000   21,000         22,000
Residential repurchase reserve   4,558   $ 4,558         5,432
Number of residential repurchase requests (in repurchase requests) | repurchase_request       5          
Number of loans repurchased | loan       0          
Residential repurchase provisions recorded       $ (900) 300        
Aggregate amount of loss contingency reserves   2,000   $ 2,000         2,000
Morgan Stanley & Co.                  
Loss Contingencies [Line Items]                  
Number of mortgage pass-through certificates issued (in certificates) | certificate       28          
Sequoia Residential Funding                  
Loss Contingencies [Line Items]                  
Number of mortgage pass-through certificates issued (in certificates) | certificate           2 2 4  
Schwab                  
Loss Contingencies [Line Items]                  
Number of other named defendants along with SRF (in plaintiffs) | Plaintiff 26                
Residential Loans                  
Loss Contingencies [Line Items]                  
Loan Principal   820,000   $ 820,000         $ 830,000
Loans held-for-investment, in foreclosure   500   500          
Other income                  
Loss Contingencies [Line Items]                  
Other income related to risk sharing agreement   1,000 $ 1,000 2,000 2,000        
Mortgage banking and investment activities                  
Loss Contingencies [Line Items]                  
Market valuation changes in fair value of guarantee asset (less than for three months ending June 30, 2015)   (1,000) $ (1,000) (1,000) $ (1,000)        
Guarantee Obligations                  
Loss Contingencies [Line Items]                  
Original unpaid balance of loans subject to risk sharing agreements   3,190,000   3,190,000          
Potential future payments on loans   44,000   44,000          
Loan Principal   $ 2,280,000   $ 2,280,000          
Weighted average original Fair Isaac Corporation (FICO) score   758   758          
Weighted average original loan-to-value (LTV) (as a percent)   77.00%   77.00%          
Guarantee Obligations | Financing Receivables, Equal to Greater than 90 Days Past Due                  
Loss Contingencies [Line Items]                  
Balance of loans 90 days or more delinquent   $ 1,000   $ 1,000          
Residential | Sequoia | FHLB Seattle                  
Loss Contingencies [Line Items]                  
Statutory interest rate per annum (as a percent)   8.00%   8.00%          
Principal value   $ 133,000   $ 133,000          
Debt instrument principal payment amount       124,000          
Debt instrument interest payment amount       11,000          
Residential | Sequoia | Schwab                  
Loss Contingencies [Line Items]                  
Principal value   15,000   15,000          
Principal balance of securities   14,000   14,000          
Debt instrument interest amount   $ 1,000   $ 1,000